Firex® by Kidde® Smoke Alarm, 120 VAC/80 mA, Ionization, Alarm: Smoke, Up to 24 Units Interconnection, 85 dB at 10 ft Alert, Red LED Alert, Up to 85% Humidity Rating, 0.5 to 0.92%/ft Sensitivity Level, LED Display, Pre-Stripped Wiring, 40 to 100 deg F Operating, Plastic, White, 5.6 in Dia X 1.8 in H